The radius of Earth at the equator is approximately 4000 miles. Suppose a jet flies once around Earth at a speed of 500 miles per hour relative to Earth. If the flight path is a neglibile height above the equator, then, among the following choices, the best estimate of the number of hours of flight is:<spanclass=′latex−bold′>(A)</span>25<spanclass=′latex−bold′>(B)</span>8<spanclass=′latex−bold′>(C)</span>75<spanclass=′latex−bold′>(D)</span>50<spanclass=′latex−bold′>(E)</span>100